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2*0,2x+2*0,3(x+3)=17
0,4x+0,6(x+3)=17
0,4x+0,6x+1,8=17 /*10
4x+6x+18=170
10x+18=170 /-18
10x=152 /:10
x=15,2
Odp. Boki wynoszą 15,2; 15,2; 18,2; 18,2.